lsp-server-v0.3.0

• Command and code action for migrating ink! 4.x projects to ink! 5.0.
• Completions for full ink! entities (i.e. inserting full Rust items not just ink! attribute macros and arguments e.g. ink! constructor and message fn items as completions when typing fn inside impl blocks e.t.c)
• Command and code action for extracting ink! events into standalone packages (only for ink! v5 projects).
• Completions and code actions for ink::combine_extensions! declarative macro.
• General performance and robustness improvements for semantic analyzer.